package demo6;

/*class Student implements Comparable<Student> {
    public String name;
    public int age;

    public Student(String name, int age) {
        this.name = name;
        this.age = age;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }

    @Override
    public int compareTo(Student o) {
        if (this.age > o.age) {
            return 1;
        }else if (this.age == this.age) {
            return 0;
        }else {
            return -1;
        }
    }
}*/

import java.util.Arrays;
import java.util.Comparator;

class Student implements Comparable<Student> {
    public String name;
    public int age;

    public Student(String name, int age) {
        this.name = name;
        this.age = age;
    }

    @Override
    public String toString() {
        return "Student{" +
                "name='" + name + '\'' +
                ", age=" + age +
                '}';
    }

    @Override
    public int compareTo(Student o) {
        return this.age - o.age;
    }
}

public class Test {
    public static void main(String[] args) {
        Student[] students = new Student[3];
        students[0] = new Student("zhangsan", 11);
        students[1] = new Student("lisi", 5);
        students[2] = new Student("wangwu", 7);
        System.out.println("排序前：" + Arrays.toString(students));

        Arrays.sort(students);

        System.out.println("排序后：" + Arrays.toString(students));

    }

    public static void main1(String[] args) {
        Student student1 = new Student("zhangsan", 10);
        Student student2 = new Student("lisi", 11);

        AgeCompare ageCompare = new AgeCompare();
        System.out.println(ageCompare.compare(student1, student2));

        NameCompare nameCompare = new NameCompare();
        System.out.println(nameCompare.compare(student1, student2));

    }
}

//比较器
class AgeCompare implements Comparator<Student> {
    @Override
    public int compare(Student o1, Student o2) {
        return o1.age - o2.age;
    }
}

class NameCompare implements Comparator<Student> {
    @Override
    public int compare(Student o1, Student o2) {
        return o1.name.compareTo(o2.name);
    }
}
